2. All cellular forms of life have one or more a. mitochondria b. chloroplast c.
ID: 300065 • Letter: 2
Question
2. All cellular forms of life have one or more
a. mitochondria
b. chloroplast
c. cellular (plasma membrane)
d. nucleus
e. intracellular membrane
f. subcellular organelle cell
3. Which statement is an incorrect descriptions of protein molecules?
a. Protein molecules range in size by more than a factor of 100
b. the 3-dimensional shape of protein molecules can be globular or elongated.
c.The association of multiple polypeptide subunits to form a functional protein is known as quaternary structure
d.Folded proteins are rigid structures, so that all the side chains are locked into one structure
e.Many proteins fold into a stable 3 dimensional structure that has a lower free energy than that unfolded state
f. The primary structure of proteins does not depend on conformation
4.Water is a major factor that drives protein folding bacteria because?
a.Water molecules are hydrophobic
b.The interactions between water molecules and the polypeptide chain are stronger for the folded protein
c.The mobility of water molecules is more restricted at the protein surface than in bulk water
d.The surface area exposed to water of a folded protein is about the same as that of an unfolded protein
e.The entropy of the unfolded polypeptide chain is higher than that of the folded polypeptide chain
5.According to the central dogma of biology information storage involves a specific macromolecule. From what monomer is this class of macromolecule made?
a.Acetate
b.Sugars
c.Amino acids
d.Nucleotides
e.Fatty acids
Explanation / Answer
2. All cellular forms of life have one or more (c) cellular (plasma membrane). Plasma membrane presence is common to all eukaryotic and prokaryotic cells.
3. Incorrect description of protein molecules: the 3-dimensional shape of protein molecules can be globular or elongated. 3D refers to the quaternary structure of protein which is wherein -helixes and -pleated-sheets are folded into a compact globular structure.
4. Water is a major factor that drives protein folding bacteria because: The entropy of the unfolded polypeptide chain is higher than that of the folded polypeptide chain
In the case of protein folding, the hydrophobic effect is important to understanding the structure of proteins that have hydrophobic amino acids clustered together within the protein. Water-soluble proteins have a hydrophobic core in which side chains are buried from water, which stabilizes the folded state. Water interactions of polypeptides decrease entropy and facilitaes folding.
5. According to the central dogma of biology information storage involves a specific macromolecule. From what monomer is this class of macromolecule made: (d) Nucleotides.
The central dogma of molecular biology describes the flow of genetic information in cells from DNA to messenger RNA (mRNA) to protein. Nucleotide sequence forms the basic unit of DNA information.
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